phpexcelreader read（）文件不可读，但可读，工作正常

尝试探索代码，似乎错误是由以下给出的：

include 'xlread/excel_reader.php';
$excel = new PhpExcelReader;

$file = 'C:/xampp/htdocs/aus/engg20/engg20/upload/xls/xls-1603808908.csv';

if(is_file($file) && file_exists($file) && is_readable($file)) echo('File found'); //this works


$excel->read('C:/xampp/htdocs/aus/engg20/engg20/upload/xls/xls-1603808908.csv'); //this gives The filename C:/xampp/htdocs/aus/engg20/engg20/upload/xls/xls-1603808908.csv is not readable

已定义标识符\ OLE：

if (substr($this->data, 0, 8) != IDENTIFIER_OLE) {
    //echo 'Error';
    $this->error = 1;
    return false;
}

我不知道如何修理它。请帮忙

define('IDENTIFIER_OLE', pack("CCCCCCCC",0xd0,0xcf,0x11,0xe0,0xa1,0xb1,0x1a,0xe1));